"I get a lot of confused reactions, like, 'I know I'm really supposed to hate you, but I really love you, but I hate what you are doing'," he joked.

"It's hard for people to process, but I worked really hard before I aired on the show to endear myself to the fans on Twitter and to make sure I was going to do it justice and to understand the world, and to a certain extent that's paid off."

Morgan also revealed that playing Klaus is "the ultimate job" because he has "always been obsessed with gothic fantasy and that genre".

"When I got the job and I said, 'I play one of the oldest vampires in the world', [my friends] said, 'Well, that's kind of perfect for you then, you are going to have a lot of fun'," he said.

"And then to make the call and go, 'I'm actually kind of half werewolf as well', they were like, 'Are you writing this for yourself?' So they just know it's a good fit for me."

The Vampire Diaries Season Four and The Complete Season 1-4 Box Set is available on Blu-ray and DVD from Monday (August 26) courtesy of Warner Home Video.